Cylindrical attrition mill with rotary midsection



Aug. 8, 1950 2, HUSZAR 2,518,143

CYLINDRICAL ATTRITION MILL WITH ROTARY MIDSECTIQN Filed June 14, 1948 5 Sheets-Sheet 1 fCZHu azar m WW5 Aug. 8, 1950 Filed June 14, 1948 K. 2. HUSZAR 2,518,143

CYLINDRICAL ATTRITION MILL WITH ROTARY MIDSECTION I 3 Sheets-Sheet 3 Patented Aug. 8, 1950 ATENT orrioe CYIJI'NDRICAL KTTRITI'ON MII'LL WITH ROTARY MIDSEGTION 'Kalman Z. :H-uszar, ;Foster, Dhio, .assignor to Wanda'Mathews HuszanFostelt, Ohio "Application June 14, 194 8 ,"Se!-ia3l"No.32,927

This invention relates to an improved grinder a d more particularly to a device for grinding sand and similar material. 7 p

""It is an object of this invention to provide a grinder of the kind to be more particularly described-hereinafter in which the material "to be ground constitutes also the grinding medium for ahrasionw ith other portions of the mass of similar material contained therein. The -=me'thod of grinding comprises rotating-a mass of material to?be ground upon another mass of the same material 'under-pressure,' 'the pressure being provided -by the weight of the other materialwhic'h it is' desired to grind.

"The grinder to be disclosed herein has been designed-primarily for use in the sand and gravel industry. =Sand, as found in its natural state, in pits containsapproximately 2 per cent of fines, that isrfland that will pass through a 100 mesh screen. In making concrete, it has been noted that sand containingabou't' 5 per cent fineaccomplishes the most desirable results. In order tojobtain the -'higher'-percentage of fine sand, either-separation and re-assorting or grinding must be resorted to. These methods are quite costly as regards machinery, labor, and time for such alowcostmaterial. Therefore, the grinder of this invention has been devised to accomplish the desired result with a minimum amount of grinding machinery and equipment through which-thesand may 'be'readily passed thus affordinga considerable saving in the cost of advancingthe grade of sand for this use.

' *"Ba'l-l mills and pulverizer hammers have been used to grind sand, but the sand to be ground has such an abrasive reaction on the grinder that thesemills are subject to and have experienced {an deterioration. In this mill or grinder, as thermaterial to be ground is used also as the glihdingmedium, the deterioration caused by reaction ofthe material to be ground is completely obviatedastl'iis reaction is utilized as a source of grinding material.

: itlotheioregoing objects, and .others which may herflinaftermore ifullyappear, the invention consists bithe novel construction, combination and arrangement otparts, as will be more specifically referred to and illustrated z-in theaccompanying drawings, but it is to be understood that changes, variations, and modifications may :be resorted to which fall within the scope of the invention as claimed.

fin the drawings:

' l '-ig-ure 1 is a top plan view of a grinder con- 7 sciaim (e1. ran-ass) I strueted accordingte embodiment :of my invention.

Figure 2 is :a side elevation thereof.

Figure .3 is avertical .section :taken on the :llne 3-. 3 of .Figure'il.

Figure 4 is a horizontal section taken onthe line :441of Figure .3.

Figure .5 is a bottom planview of the grinder.

Figure .6 is .a fragmentary detailed section showing theattachment'of an extension hopper to the stationary body.

Referring to the drawings, the numeral :l;.0 designates generally an improved grinder or pullverizer for reducing :the size rofssanidas taken from .the pits to the desirable size :for commercial use of the same. Sand zas taken from'the pit usually contains about 2 per cent -,of finesf that is, grains'which will pass through a ;1i001nes'h screen. "In the commercial use Sci sand .for concrete it has been found that the lsand should contain about 5 :percent finesfor the most desirable result and effect of 'the concrete. .As stated above,"it is necessary to employpulverizersof one kind :or another to reduce the large amount 10f sand to the desirable grain size for the commercial use. Pulverizers and grinders having hammers or ball mills are materially deteriorated the grinding of sand due to the abrasive effectv of the sand on the grinding medium. The principal object" of this invention to employ certain masses of sand as the-abrasive medium for reducthe grain size 'of the main mass of sand to he -reduced. I have found that a grindero'f the kind to "be described hereinafter is suitable ecu-- nomically from all points of view for obtaining the desired results-as described above.

The grinder Ill is formed of an exterior frame having vertical supporting posts ll connected together by horizontal frame *members 12. The framemembers l2 are 'fixed'to the-upper end of the verticalposts II for definingthe fixed frame work on which the grinder is supported. "The grinder includes a cylindrical body 14 having an upper section l5, a bottom section 1'6 and an'intermediate rotating section H The upper section "5 is open at the top and bottom andan'annular flange as I8 is fixed about the upper open edge for attachment to a hopper or other source o f material supply. "The intermediate rotating section '11 is openatthe top and bottom thereof and. the walls of the intermediate section'register in alignment with the walls of the upper section I5; "The lower section 1 6 is closed at the bottom thereof 'by a bottom wall 119 fixed to or formed between :the annular Walls Zil'zthereof. The side v 3 walls of the section l6 register in vertical alignment with the walls 2| of the intermediate section IT. The intermediate bracing bars as 22 are fixed between horizontal bars 30 intermediate the length of the vertical frame members H. An annular bearing member 25 is fixed about the periphery of the intermediate member I! intermediate the length of the walls 2| thereof.

A bearing member 25 is substantially L-shaped in cross section having a vertical arm 26 which is adapted to be fixed on the side walls 2! and a horizontally extending arm 21 which extends outwardly from the walls. Roller bearings as 28 are rotatably mounted on intermediate frame work of the main frame I l. The bearings 28 are disposed in a vertical plane so that the surface of the bearings engages the lower surface of the horizontal arms 2! of the bearing members 25. The bearings 28 thus rotatably support the intermediate body section l1. Another bearing as 29 is rotatably mounted adjacent the bearings 28. The bearing 29 is disposed in a horizontal plane so that the outer surface of the bearings engage the outer peripheral edge of the horizontal arm 21. Bearings 28 and 29 are supported on the intermediate frame members 30 along the length of the vertical members ll. Rollers 2B and 29 are also mounted on the intermediate frame members 22 so that the bearings for the rotatable section of the grinder will engage the bearing member 25 at equal distances about the periphery thereof.

Angle members as 3! are fixed between the upper frame members l2 and the upper end of the fixed body section [5 for securely attaching and positioning the upper body member in place. Angle bars or brackets as 32 are fixed between the periphery of the lower body section 56 and other intermediate frame members below the supports 30 for the rotating body section.

-The bottom wall IQ of the lower section I6 is formed with a discharge opening 34 therein. A bearing 35 which includes a depending bolt 36 extends downwardly from the lower surface of the bottom wall 19. A lever 3'! is pivotally mounted intermediate its length on the pivot bolt 36 and a valve member as 38 is fixed on one end of the lever 31. The valve member 38 is adapted to close the opening 34 through the bottom wall I9 for retaining a mass of material within the body of the grinder.

A truncated conical guide member 40 is fixed on the frame which supports the grinder below the discharge opening 34. The funnel 40 is spaced below the discharge opening 34 and the valve 38. The funnel 49 is fixed relative to the frame by being attached to the vertical frame members H by suitable angle bars 4|. The

funnel 4B is adapted to guide the discharged sand or material from the lower end of the grinder onto the upper stretch 42 of a flexible belt or conveyor which is positioned below the grinder In. The free end of the conveyor is adapted to be positioned within the confines of the frame work I! so that the sand discharged from the grinder Ill will be carried away to a suitable place for removal or storage.

ment with the vertical walls of the upper fixed body section l5. An annular flange as 52 is fixed to or formed on the lower end of the extension hopper 50 and is adapted to abut the annular flange I8 about the upper end of the upper body section l5.

An annular grooved guide member as 60 is fixed to or formed about the periphery of the rotating body section IT. The grooved member 60 constitutes a pulley'concentric to the body section l1 and fixed about the outer wall thereof. The grooved member 60 is fixed as shown in Figure 3 to the vertical arm of the bearing member 25. A motor as 6! is fixed on the frame members II by a base plate 62 which is secured to the motor and is attached by suitable fastening means to the intermediate frame members 30 and 61. A pulley 64 is mounted on the shaft of the motor 6| and a belt as 65 is engaged about the pulley B4 and around the grooved guide member 60 carried by the rotating section H. In this manner the rotating member ll may be rotated relative to the fixed sections I5 and 16 by the energization of the motor 6i.

In the use and operation of the grinder III the body thereof is substantially filled with sand so that a mass of sand is contained within each of the sections I5, l6 and 51 thereof. When the motor 5! is energized the intermediate body section ll will be rotated relative to the adjacent body sections [5 and I6. The rotation of the walls 25 will then effect the rotation of the mass of sand contained therein. The gravitational force of the sand within this body section and the force of the sand exerted downwardly on this mass by the mass of sand above it in the body section [5 will effect the adhesive connection between the sand in the rotating section and the walls 2 l. The rotating mass in the rotating section ll will then be in abrasive contact with the mass of'sand in the adjacent sections. The abrasive effect of the rotating mass of sand will result in the grinding of the masses of sand at the contact of the rotating and fixed masses. In this manner the sand to be ground is actually ground by the adjacent masses of the same sand. In other words, the material to be ground is effectively the grinding medium. During the grinding operation wherein the intermediate body section I7 is rotated relative to the fixed body sections l5 and IS, the valve 38 is adjusted to control the rate of discharge through the opening 34, thus producing the degreeof grinding desired. The grinding operation is continuous, the valve 38 may be moved from its position below the opening 34 by movement of the handle 66 on the opposite end of the lever 3'1.

I claim:

1. An improved grinder of the kind described comprising a supporting frame, a pair of stationary and axially spaced apart vertical walled concentric cylindrical members fixed on said frame, an open ended cylindrical member between said spaced apart members and concentric thereto all three cylindrical members being of substantially the same diameter, and a closure plate secured to the bottom of the lower of said members, roller means on said frame engaging the periphery of the latter cylindrical member for rotatably mounting said latter cylindrical member on said frame, driving means carried by said frame engaging said rotating member for rotation relative to said spaced apart members.

2. An improved grinder of the kind described comprising a frame, a pair of vertical walled sta-. tionary and axially spaced apart concentric cylindrical members fixed to said frame, a closure plate secured to the bottom of the lower of said pair of members, an open ended vertical walled cylindrical member disposed between said pair of members in end confronting relation thereto, all three cylindrical members being of substantially the same diameter, roller means'on said frame engaging the periphery of said open ended member for rotatably mounting said latter member on said frame, driving means on said frame engaging said rotatable cylindrical member for causing rotation thereof, a discharge opening formed through said closure plate, and a valve carried by said plate adapted to selectively obstruct flow of material through said discharge opening.

3. An improved grinder of the kind described comprising a frame, a top vertical walled stationary cylindrical member fixed on said frame, a bottom vertical walled cylindrical member fixed on said frame spaced axially downwardly from, and disposed concentrically with, said top member, a closure plate sealing the lower end of said bottom member, a vertical walled intermediate cylindrical member disposedbetween said top and bottom members, all three of said cylindrical members being of substantially thesame diameter, an outwardly extending annular flange on said intermediate member, first roller means on said frame engaging under said flange, second roller means 6 on said frame engaging the peripheral edge of said flange whereby said intermediate member is rotatably supported on said frame, driving means on said frame engaging the periphery of said intermediate member for effecting rotation of the latter, a discharge opening formed in said closure plate, and valve means carried by said plate and adapted to regulate the flow of material through said opening.

KALMAN z. HUszAR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

